As far as we know, 86 Day was the first of the chassis code-based holidays in the JNC community. Toyota even started an official 86 Festival in Japan at Fuji Speedway on August 6. Can you think of any earlier ones? All hail the Hachiroku on this sacred day, the day of 86es.
I suppose you could argue that Daikoku Futo is on the way home from Hibiya to Shinjuku tonight?